Zigzag line defects and manipulation of colloids in a nematic liquid crystal in microwrinkle grooves

Takuya Ohzono, Jun Ichi Fukuda

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

Spatially confined liquid crystals exhibit non-uniform alignment, often accompanied by self-organised topological defects of non-trivial shape in response to imposed boundary conditions and geometry. Here we show that a nematic liquid crystal, when confined in a sinusoidal microwrinkle groove, exhibits a new periodic arrangement of twist deformations and a zigzag line defect. This periodic ordering results from the inherent liquid crystal elastic anisotropy and the antagonistic boundary conditions at the flat liquid crystal-air and the curved liquid crystal-groove interfaces. The periodic structure can be tuned by controlling the groove geometry and the molecular chirality, which demonstrates the importance of boundary conditions and introduced asymmetry for the engineering of topological defects. Moreover, the kinks in the zigzag defects can trap small particles, which may afford a new method for manipulation of colloids. Our system, which uses easily fabricated microwrinkle grooves, provides a new microfabrication method based on the arrangement of controllable defects.

Original languageEnglish
Article number701
JournalNature communications
Volume3
DOIs
Publication statusPublished - Mar 7 2012
Externally publishedYes

Fingerprint

Liquid Crystals
Nematic liquid crystals
Colloids
grooves
colloids
manipulators
liquid crystals
Defects
defects
Boundary conditions
boundary conditions
Microtechnology
elastic anisotropy
Geometry
Chirality
Microfabrication
Periodic structures
Anisotropy
geometry
chirality

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Zigzag line defects and manipulation of colloids in a nematic liquid crystal in microwrinkle grooves. / Ohzono, Takuya; Fukuda, Jun Ichi.

In: Nature communications, Vol. 3, 701, 07.03.2012.

Research output: Contribution to journalArticle

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